A large blue bird, Blitz made his debut on September 13, 1998, at the Seahawks' home opener at the Kingdome in Seattle, Washington.

After his inception Blitz's appearance changed slightly several times (including subtle changes in color in accordance with the team's updated scheme implemented after moving to Qwest Field in 2002) before a dramatic facelift in 2004, in an effort to make him appear less menacing to children by introducing friendlier facial features.

In addition to the longstanding look of a blue anthropomorphic bird of medium height and wearing a Seahawks uniform (number 0), the updated Blitz features the piercing green eyes and blue and gray head represented on the team logo.

In addition to all Seahawks home games, Blitz appears at hundreds of community and charity events throughout the year.

The band The Presidents of the United States of America recorded his theme song, "This Is a Blitz.